Worked example

Rear extension with a flat roof

A typical single-storey rear extension with a flat roof, run through Plimbu. Here's the kind of planning outcome and cost estimate you'd see for a property like this.

This is an illustrative example based on a typical property — not an assessment of any specific address. Check your own property →

Illustrative rear extension with flat roof — Illustrative visualisation based on a Plimbu proposal — refined for clarity. Your own result may look slightly different.

What permission might I need?

Scotland · Permitted Development may be possible. The current checks do not strongly suggest a planning application, subject to the usual technical and legal checks.

Planning permission Not likely required
Building Warrant Required

What should I do next?

Building Warrant Do this first
Certificate of Lawfulness Recommended
Neighbour agreement Recommended
Structural Engineer Recommended
Contractor Quotes Later
Measured Drawings Optional

Indicative costs

Build £42,500–£61,500
Professional fees £2,500–£5,500
Statutory fees £500–£2,500
Contingency 15%
Overall estimate £52,000–£79,500 total

Costs and planning signals on example pages are illustrative only. Your property, constraints, and council area will differ. Use Check my property for a summary based on your address.